package com.gzs.learn.admin.service.impl;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.gzs.learn.admin.common.constant.AdminConstants;
import com.gzs.learn.admin.common.constant.UserConstants;
import com.gzs.learn.admin.common.core.domain.entity.SysDictData;
import com.gzs.learn.admin.common.core.domain.entity.SysDictType;
import com.gzs.learn.admin.common.exception.CustomException;
import com.gzs.learn.admin.common.utils.DictUtils;
import com.gzs.learn.admin.common.utils.StringUtils;
import com.gzs.learn.admin.mapper.SysDictDataMapper;
import com.gzs.learn.admin.mapper.SysDictTypeMapper;
import com.gzs.learn.admin.service.ISysDictTypeService;
import com.gzs.learn.admin.util.PageUtil;
import com.gzs.learn.inf.PageResponseDto;
import com.gzs.learn.inf.PageResponseDto.PageResponse;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.PostConstruct;
import java.util.List;

import static java.util.Objects.isNull;
import static java.util.Objects.nonNull;

/**
 * 字典 业务层处理
 *
 * @author guanzhisong
 */
@Service
@RequiredArgsConstructor
public class SysDictTypeServiceImpl implements ISysDictTypeService {
    private final SysDictTypeMapper dictTypeMapper;

    private final SysDictDataMapper dictDataMapper;

    /**
     * 项目启动时，初始化字典到缓存
     */
    @PostConstruct
    public void init() {
        Page<?> page = new Page<>(1, AdminConstants.MAX_RECORDS_LIMIT);
        IPage<SysDictType> pageInfo = dictTypeMapper.selectDictTypeAll(page);
        for (SysDictType dictType : pageInfo.getRecords()) {
            IPage<SysDictData> dictDataPage = dictDataMapper.selectDictDataByType(page, dictType.getDictType());
            DictUtils.setDictCache(dictType.getDictType(), dictDataPage.getRecords());
        }
    }

    /**
     * 根据条件分页查询字典类型
     *
     * @param dictType 字典类型信息
     * @return 字典类型集合信息
     */
    @Override
    public PageResponseDto<SysDictType> selectDictTypeList(SysDictType dictType) {
        Page<?> page = PageUtil.getPage();
        IPage<SysDictType> pageInfo = dictTypeMapper.selectDictTypeList(page,dictType);
        return PageUtil.buildPageResponse(pageInfo);
    }

    /**
     * 根据所有字典类型
     *
     * @return 字典类型集合信息
     */
    @Override
    public PageResponseDto<SysDictType> selectDictTypeAll() {
        IPage<SysDictType> pageInfo = dictTypeMapper.selectDictTypeAll(PageUtil.getMaxPageParam());
        return PageUtil.buildPageResponse(pageInfo);
    }

    /**
     * 根据字典类型查询字典数据
     *
     * @param dictType 字典类型
     * @return 字典数据集合信息
     */
    @Override
    public PageResponseDto<SysDictData> selectDictDataByType(String dictType) {
        List<SysDictData> dictDatas = DictUtils.getDictCache(dictType);
        Page<?> p = PageUtil.getPage();
        if (StringUtils.isNotNull(dictDatas)) {
            PageResponse pageResponse = PageResponse.builder().page((int)p.getCurrent()).pageSize((int)p.getSize()).total(dictDatas.size()).build();
            return PageResponseDto.success(dictDatas, pageResponse);
        }
        IPage<SysDictData> pageInfo = dictDataMapper.selectDictDataByType(PageUtil.getMaxPageParam(), dictType);
        dictDatas = pageInfo.getTotal() > 0 ? pageInfo.getRecords() : null;
        if (StringUtils.isNotNull(dictDatas)) {
            DictUtils.setDictCache(dictType, dictDatas);
            PageResponse pageResponse = PageResponse.builder().page((int)p.getCurrent()).pageSize((int)p.getSize()).total((int)pageInfo.getTotal()).build();
            return PageResponseDto.success(dictDatas, pageResponse);
        }
        return null;
    }

    /**
     * 根据字典类型ID查询信息
     *
     * @param dictId 字典类型ID
     * @return 字典类型
     */
    @Override
    public SysDictType selectDictTypeById(Long dictId) {
        return dictTypeMapper.selectDictTypeById(dictId);
    }

    /**
     * 根据字典类型查询信息
     *
     * @param dictType 字典类型
     * @return 字典类型
     */
    @Override
    public SysDictType selectDictTypeByType(String dictType) {
        return dictTypeMapper.selectDictTypeByType(dictType);
    }

    /**
     * 批量删除字典类型信息
     *
     * @param dictIds 需要删除的字典ID
     * @return 结果
     */
    @Override
    public int deleteDictTypeByIds(Long[] dictIds) {
        for (Long dictId : dictIds) {
            SysDictType dictType = selectDictTypeById(dictId);
            if (dictDataMapper.countDictDataByType(dictType.getDictType()) > 0) {
                throw new CustomException(String.format("%1$s已分配,不能删除", dictType.getDictName()));
            }
        }
        int count = dictTypeMapper.deleteDictTypeByIds(dictIds);
        if (count > 0) {
            DictUtils.clearDictCache();
        }
        return count;
    }

    /**
     * 清空缓存数据
     */
    @Override
    public void clearCache() {
        DictUtils.clearDictCache();
    }

    /**
     * 新增保存字典类型信息
     *
     * @param dictType 字典类型信息
     * @return 结果
     */
    @Override
    public int insertDictType(SysDictType dictType) {
        int row = dictTypeMapper.insertDictType(dictType);
        if (row > 0) {
            DictUtils.clearDictCache();
        }
        return row;
    }

    /**
     * 修改保存字典类型信息
     *
     * @param dictType 字典类型信息
     * @return 结果
     */
    @Override
    @Transactional
    public int updateDictType(SysDictType dictType) {
        SysDictType oldDict = dictTypeMapper.selectDictTypeById(dictType.getDictId());
        dictDataMapper.updateDictDataType(oldDict.getDictType(), dictType.getDictType());
        int row = dictTypeMapper.updateDictType(dictType);
        if (row > 0) {
            DictUtils.clearDictCache();
        }
        return row;
    }

    /**
     * 校验字典类型称是否唯一
     *
     * @param dict 字典类型
     * @return 结果
     */
    @Override
    public String checkDictTypeUnique(SysDictType dict) {
        Long dictId = isNull(dict.getDictId()) ? -1L : dict.getDictId();
        SysDictType dictType = dictTypeMapper.checkDictTypeUnique(dict.getDictType());
        if (nonNull(dictType) && dictType.getDictId().longValue() != dictId.longValue()) {
            return UserConstants.NOT_UNIQUE;
        }
        return UserConstants.UNIQUE;
    }
}
